Hypex Electronics UCD102 User manual

Hypex Electronics BV
Kattegat 8
9723 JP Groningen, The Netherlands
[phone]
[e-mail]
www.hypex.nl
Dual Channel High Efficiency Power Amplifier Module
Highlights
Flat, fully load-independent frequency
response
Low output impedance
Very low, frequency-independent THD
Very low noise
Fully passive loop control
Consistent top performer in listening
trials
Features
Runs on unregulated +/- rails
Pop-free start and stop control
Differential audio input
DC-fault detection
Overcurrent protection
Weight: 55 g / Height: 24mm
Applications
Monitor loudspeakers for recording
and mastering studios
Audiophile power amplifiers for
professional and consumer use
Public Address systems
Home theatre systems
Active loudspeakers
Description
The UcD102 amplifier module is a dual channel self-contained high-performance class D amplifier
intended for a wide range of audio applications, ranging from Public Address systems to ultrahigh-
fidelity replay systems for studio and home use. Chief distinguishing features are flat frequency
response irrespective of load impedance, nearly frequency-independent distortion behaviour and very
low radiated and conducted EMI. Control is based on a phase-shift controlled self-oscillating loop
taking feedback only at the speaker output.

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Contents
Contents ........................................................................................................................................................... 2
1Performance data....................................................................................................................................2
2Audio Input Characteristics....................................................................................................................2
3Absolute maximum ratings ................................................................................................................... 3
4Recommended Operating Conditions ................................................................................................... 3
5Connections ............................................................................................................................................. 4
6Typical Performance Graphs.................................................................................................................. 7
7Mechanical Dimensions..........................................................................................................................9
8Bridge-tied load (BTL) ...........................................................................................................................10
1Performance data
Power supply = +/-35V, Load=4Ω, MBW=40kHz, Source imp=40Ω,unless otherwise noted
Item
Symbol
Min
Typ
Max
Unit
Notes
Max Output Power
PR2Ω
-
60
-
Wrms
THD=1%
PR4Ω
-
100
-
Wrms
PR8Ω
-
60
-
Wrms
Distortion
THD+N
-
0.03
0.05
%
20Hz<f<20kHz.
Pout<PR/2
-
-
0.03
%
20Hz<f<20kHz Pout=1W
Output noise
UN
-
17
25
V
Unwtd, 20Hz-20kHz
Output Impedance
ZOUT
-
-
22
mΩ
f<1kHz
-
-
90
mΩ
f<20kHz
Power Bandwidth
PBW
20-35k
Hz
Frequency Response
DC
-
48k
Hz
+0/-3dB. All loads.
Voltage Gain total
AV
13.3
13.5
13.7
dB
Supply Ripple Rejection
PSRR
60
65
-
dB
Either rail, f<1kHz.
Required input level for
100W/4Ω
4.25
V
Appropriate supply
voltage assumed
Efficiency

92
%
Full power
Idle Losses
P0
-
4
4.5
W
External VDR
-
6
7
Internal VDR
Standby Current
ISTBY
-
5
7
mA
Positive rail
-
9
12
Negative rail
Current Limit
6
8
A
2Audio Input Characteristics
Item
Symbol
Min
Typ
Max
Unit
Notes
Input Impedance
ZIN
1.8k
Ω
Either input to ground
CM Rejection Ratio
CMRR
55
dB
All frequencies

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3Absolute maximum ratings
Correct operation at these limits is not guaranteed. Operation beyond these limits may
result in irreversible damage.
Item
Symbol
Rating
Unit
Notes
Power supply voltage
VB
+/-48
V
Shuts down when either rail exceeds 50V
Peak output current
IOUT,P
8
A
Unit current-limits at 8A
Input voltage
VIN
+/-12
V
Either input referred to ground
Air Temperature
TAMB
55
°C
Heat-sink temperature
TSINK
90
°C
User to select heat sink to insure this
condition under most adverse use case
4Recommended Operating Conditions
Item
Symbol
Min
Typ
Max
Unit
Notes
Power supply
voltage
VB
201)
36
422)
V
Load impedance
ZLOAD
1
Ω
Source impedance
ZSRC
100
Ω
Effective power
supply storage
capacitance
CSUP
47003)
F
Per rail, per attached
amplifier. 4Ωload
presumed.
Note 1: Reduced performance.
Note 2: Unit shuts down when either rail exceeds 50V.
Note 3: The effective power supply storage capacitance of Hypex SMPS is already in excess of
4700F. Do not add supplementary capacitance.

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5Connections
In order to ease connecting the amplifier, all necessary connections to operate the amplifier are
grouped in one standard 2.54mm pitch dual row 18 pin header.
Pin
Type
Function
1,2
Output
CH1 Loudspeaker connection (hot)
3,4
Output
CH1 Loudspeaker connection (cold) 1)
5
Input
CH1 Audio input ground connection1)
6
Input
CH1 Inverting audio input
7
Input
CH1 Non-inverting audio input
15,16,22
Input
Power supply ground connection1)
17,18
Input
Positive power supply connection
19,20
Input
Negative power supply connection
21
Input
Driver voltage, connect to GND or to external driver voltage2)
27
Input
ON/OFF control (Active low)
28
Output
DC-fault detection (Open collector - Active low)
30
Input
CH2 Non-inverting audio input
31
Input
CH2 Inverting audio input
32
Input
CH2 Audio input ground connection1)
33,34
Output
CH2 Loudspeaker connection (cold) 1)
35,36
Output
CH2 Loudspeaker connection (hot)
Note 1: Pin 3, 4, 5, 15, 16, 22, 32, 33 and 34 are physically connected to the same potential
(ground).
Note 2: Dissipation in the UcD102 can be lowered by using external driver voltage other than GND,
see section 5.5 for additional info.
Figure 1. Connector pinning UcD102

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5.1 DC-Error Detection Characteristics
The UcD102 has an integrated DC-error detection which will pull pin 28 low in case of such an event.
It is recommended to sense this fault condition and to interrupt both power supply lines in such an
event.
Item
Type
Min
Typ
Max
Unit
Notes
Voltage on pin 28, DC-
error
Output
1
V
Internal open collector1)
Note 1: Must be pulled to a positive voltage by means of an external resistor. Open collector
maximum output current: 100mA. Maximum collector voltage: 65V.
Figure 2.
DC-Error Output interface.
5.2 Amplifier On/OFF Characteristics
Pulling pin 27 low enables the amplifier. Leaving pin 27 floating will put the amplifier in standby. This
pin may be driven from a logical output or an open collector.
Item
Min
Typ
Max
Unit
Notes
Voltage on pin 27, left floating
3
V
Internally pulled up
Pull-up current
20
40
uA
Threshold voltage
1.8
2.2
2.7
V
Permissible voltage range
-5
-
75
V
Figure 3.
Amplifier On/Off Control interface.

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5.3 Input buffer recommendation
The UcD102 has no on-board input buffer. Applications that require a higher gain and/or a higher
input impedance benefit from a buffer stage like shown below.
Figure
4.
Recommended Input
buffer stage.
5.4 Amplifier start-up delay
During initial power up the amplifier is disabled for approx. 1.5s regardless of the state of pin 27. Once
powered up there is no start or stop delay.
5.5 External Driver Voltage Connection
An internal linear VDR regulator is available. In order to minimize dissipation in multi-channel
applications an external voltage source can be connected. The VDR reference must be connected to
the negative supply rails(!). Driver current is independent of driver voltage, regulator losses increase
linear with applied voltage. If no external VDR is available the input should be connected to GND in
order for the UcD102 to operate.
Item
Min
Typ
Max
Unit
Notes
External driver voltage
13
-
GND
V
1)
Driver current amp muted
-
8
mA
Driver current
-
85
mA
Note 1: This voltage is in respect to the negative supply rails, if no external driver voltage is available,
connect to GND

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6Typical Performance Graphs
The graphs were taken on one stock UcD102 module powered by an SMPS400A100. Refer to the
tables in section 1 for guaranteed limits.
6.1 THD+N over power and frequency
THD+N vs. power at 100Hz (blue), 1kHz (green) and 6kHz (red) (2Ω).
THD+N vs. Frequency at 1W in 2Ω(blue), 4Ω(green) and 8Ω(red).
THD+N vs. power at 100Hz (blue), 1kHz (green) and 6kHz (red) (4Ω).
THD+N vs. Frequency at PR/2 in 2Ω(blue), 4Ω(green) and 8Ω(red).
THD+N vs. power at 100Hz (blue), 1kHz (green) and 6kHz (red) (8Ω).
0.001
1
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
%
10m 10020m 50m 100m 200m 500m 1 2 5 10 20 50
W
0.001
1
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
%
20 20k50 100 200 500 1k 2k 5k 10k
Hz
0.001
1
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
%
10m 10020m 50m 100m 200m 500m 1 2 5 10 20 50
W
0.001
1
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
%
20 20k50 100 200 500 1k 2k 5k 10k
Hz
0.001
1
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
%
10m 10020m 50m 100m 200m 500m 1 2 5 10 20 50
W

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6.2 Frequency Response (4Ω, 8Ωand open circuit)
6.3 Output Impedance
6.4 18,5+19,5kHz IMD (10W, 8Ω)

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7Mechanical Dimensions

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8Bridge-tied load (BTL)
This two channel amplifier can be utilized in Bridge Tied Load configuration. This is especially useful
for high impedance loads. In a bridge-tied load configuration, channel 1 is driving one side of a load
and channel 2 is driving the other side of the load. The signal input of channel 2 is the inverted
signal input of channel 1. Note that this does not affect the phase of the signal. A BTL configuration
results in double the voltage swing across the load compared to a single-ended configuration where
one side of the load is tied to an amplifier and the other side to ground.
In the graphical representation above, the BTL principle is depicted. By inverting the signal input of the second
channel, the output voltage amplitude is doubled. Please note that the negative (GND) output terminals are tied
together. On the UcD102 module, this is already implemented in the design and therefor these pins can be left
unconnected.
In a bridge-tied load configuration, the load impedance which each amplifier channel ‘sees’ is half
the characteristic impedance of the connected speaker. Therefor the minimum load in BTL
configuration is 4Ω, however, we recommend to use only a BTL configuration with a load of 8Ωor
higher.
Parameter
Remarks
Symbol
Min
Typ
Max
Unit
Max Output Power
1KHz, THD=1%,
Bridge-tied load (BTL)
PR, 4Ω
-
-
100
Wrms
PR, 8Ω
-
-
200
Wrms
Voltage Gain
Bridge-tied load (BTL)
AV
19
19.5
20
dB
Loudspeaker impedance
range
Bridge-tied load (BTL)
ZL,SE
4
8
-
Ω
8.1 Typical Performance Graphs BTL
THD+N vs. power at 100Hz (blue), 1kHz (green) and 6kHz (red) (BTL - 4Ω).
THD+N vs. power at 100Hz (blue), 1kHz (green) and 6kHz (red) (BTL - 8Ω).
Ls1+
Ls1-
Ls2+
Ls2-
Ground tie
Speaker connection Channel
inversion
In1+
In1-
In2+
In2-
input
Bal+
Bal-
source
Bal-
Bal+
Source connection Speaker connection
The input signal must be anti-parallelconnected
to the module's channel.
This can be done physically, but one can also
choose to invert the signal in a DSP.
0.001
1
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
%
10m 20020m 50m 100m 200m 500m 1 2 5 10 20 50 100
W
0.001
1
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
%
10m 30020m 50m 100m 200m 500m 1 2 5 10 20 50 100 200
W